Valve silencer



Ma rch 11, 1930. w AN 1,7505377 VALVE SILENCER Filed May 25. 1928 Inberitor' M'a ma f Atzarzzqy Patented Mar. 11, 1930 ALBERT WIDMAN, F NEWCASTLE, INDIANA PATENT OFFICE VALVE SILENCEB Application filed May 23,

to can be readily and easily positioned on the r end of a valve stem for cooperation with the valve tappet cam, means being provided for maintaining the silencer in engagement with the cam or tappet,

A further object is to provide a valve si lencer which includes a non-metallic impact member for disposition between the valve stem and its tappet. i

Still a further object is to provide a valve silencer of the above mentioned character which is simple in construction, inexpensive, 7

strong and durable and further well adapted to the purpose for whichit is designed.

Other ob'ects and advantages of the invention will become apparent from the following description when taken in connection with the accompanying drawing.

In the accompanying drawing wherein like reference characters indicate like parts throughout the several views:

Figure 1 is a side elevation of the valve silencer embodying my invention, showing the same associated with-the tappet of a rocker arm employed with an engine having overhead valves, and showing the manner in L which the silencer is positioned on theupper end of the valve stem.

Figure 2 is a similar view showin the silencer positionedon the lower end 0 a valve stem and in engagement with a ta pet that is associated with an engine of a di erent type.

Figure 3 is a vertical sectional view through the valve silencer per se.

Figure 4 is a bottom plan view thereof, and

Figure 5 is a detail perspective view of the non-metallic impact member. v

In the drawing wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates generally my improved valve silencer,

1928. Serial No. 279,991.

the same comprising a metallic sleeve 2 that is formed at one end with a relatively thick annular flange 3 on itsouter face and as is clearly disclosed in Figure 3, the outer face of this flange is rounded. The outer end of the sleeve 2 is formed in its bore with the annular beveled retaining lip a, the purpose of which will be presently described.

The other end of the sleeve has its inner and outer walls beveled as illustrated at 5 and 6, respectively, and this feature is also clearly illustrated in Figure 3. 7

Initially the sleeve 2 is formed of soft steel and after thelip 4 has been formed, the structure is case-hardened.

Also forming a salient part of the present invention is the non-metallic impact member 7 shown in Figure 5, and this impact member may be constructed of a suitable composition including fiber or the like. The impact member is in the form of a circular plug which is of a diameter slightly greater than the diameter of the bore of the sleeve and is adapted to be pressed through the bore, the beveled inner end 5 providing a means for guiding the impact plug into the bore of the sleeve, the .outer edge portion of this nonmetallic plug 7 is beveled as at 8 for cooperation with the beveled lip 4, and furthermore the outer face'of this plug is rounded to provide a convex tappet engaging surface 9. As is clearly shown in Figure 3, the convex surface 9 of this impact plug 7 when in roper position in the outer end of the sleeve orms ,a continuation of the curved outer face of the flange 3.

In Figure 1 whereinthe valve silencer is shown as being use in conjunction with the taplpet 10 associated with one end of the roc or arm 11 of an engine of the overhead valve type. The sleeve 2 is slidably fitted on the u per end of the valve stem 12. The usual va ve spring associated with the valve stem is shown at 13, and the cap 14 is secured on the valve stem for engagement with the upper end of the valve spring 13. in the conventional manner. A washer 15 is disposed on the upper end portion of the valve stem 12 for rest on the cap 14, and a relatively light coil spring 16 encircles this upper end portion of the valve stem and the sleeve 2 of the valve silencer 1. The lower end of the coil spring 16 engages with the washer 15, while the upper end engages with the bottom face of the flange 3 for the purpose of normally urging the convex surface 9 of the non-metallic impact member 7 upwardly and in engagement with the tappet 10.

In Figure 2, the valve silencer is shown as being associated with a different type of valve actuating mechanism wherein the lower end of the valve stem17 has ordinary engagement with the tappet 18, which tappet is vertically slidable through suitable guide means (lnot shown) at a point above the usual cam s aft and the cam engages with the lower end of this tappet 18 in the manner also well known in the art.

A. relatively light coil spring 19 encircles the lower end ortion of the valve stem 17 on which is slidably fitted the valve silencer 1, the lower end of the spring engaging with the 'flange 3, while the other end of said spring engages with a washer 20 that is arran ed on the valve stem for disposition agalnst the bottom of the valve spring cap 21, the valve springbeing shown at 22.

It will thus be seen from the foregoing de- I scrlption that I have provided a valve silencer for association with the valve actuatin mechanism of an engine of an automobile for eliminating the clicking noises that as a rule are incidental to the valve operation. Furthermore, the valve silencer will prevent the wear of the end of the valve stem that has normal engagement with the 'tappet, thus prolonging the life of the valve stem. Also, the use of a valve silencer of the above mentioned character will tend to increase the eificiency of the operation of the engine as the valves will be caused to seat properly, thereby resulting in a reduction of the fuel consumption necessary to operate the engine.

The simplicity of my device enables the same to be constructed at a very low cost and by employing a non-metallic impact member,

the same may be used for an indefinite time I without necessitating replacement.

While I have shown the referred embodiment of my invention, it is to be understood that minor changes in the size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention and the scope of the appended claim.

Having thus described the invention, what I claim as new is A valve silencer of the character described comprising 'a sleeve having a bore of uniform diameter throughout adapted to be mounted on a valve rod, a beveled annular retaining flange 'on one end of the sleeve extending into the bore, a rounded head on one vend portion of the sleeve providin an annular shoulder on said sleeve interme ate its ends,

with

the outer surfaces of the head and flange being concentrically curved, a compresslble plug'having a convex upper end concentric the flange and head and an inwardly beveled portion adjacent said upper end for engagement with the flange, detachably mounted in the bore and having 1ts beveled portion engaged with the flange and its side wall frictionally engaging the wall of the bore, an expansible spring encircling the sleeve having one end supported on the valve rod and its opposite end impinged against the shoulder for urging the sleeve longitudinally on said rod.

In testimony whereof I aflix my slgnature.

- ALBERT WIDMAN. 

